Subject:
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Re: RCX Controlled Air Compressor Tester
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Newsgroups:
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lugnet.robotics, lugnet.build
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Date:
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Wed, 29 Sep 1999 23:10:55 GMT
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Viewed:
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16 times
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In lugnet.robotics, Chris Phillips writes:
> In lugnet.robotics, Ralph Hempel writes:
> > I really wish there was a way to control pneumatics with Mindstorms....
>
> Actually, I've been thinking about this for awhile, and I think there's an
> "easy" way to switch pneumatics under motor control. The rubber air hoses can
> be pinched shut with a reasonably small amount of force. It seems to me that
> you could use a cam on an axle to open or close one (or several) air hoses by
> turning a motor to a particular angle.
>
> You'd probably also need a master shutoff valve (on a separate motor?) so that
> you could shut off the air pressure while you rotate the cam shaft to the
> desired position. After the cams are set, you'd open the master valve to
> actuate the pistons.
>
> If you wanted to be stingy with RCX inputs and outputs, you could use a
> progressive gear ratio setup to control any number of cams "independently" off
> of a single motor. And you could use one of my favorite motor-saving
> mechanisms, Michael Powell's directional transmission, to control the master
> valve when the motor turns in one direction and the cam shaft when it turns in
> the other direction.
>
> OK, so you still need at least one motor output and probably a rotation sensor
> input to control this thing. And a battery box and another motor to run the
> compressor. But once you've got that, you could probably do some fairly
> complex switching to control the pneumatics from the RCX.
>
> Of course I haven't tried this, but maybe someone out there will... If so,
> please come back and tell us all how you make out.
I just read some of the earlier messages in this thread. I think Michael
Powell deserves a medal for having not one, but two of his Lego designs get
mentioned independently of one another in a single discussion.
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Message is in Reply To:
 | | Re: RCX Controlled Air Compressor Tester
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| (...) Actually, I've been thinking about this for awhile, and I think there's an "easy" way to switch pneumatics under motor control. The rubber air hoses can be pinched shut with a reasonably small amount of force. It seems to me that you could use (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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